Are there any good tools for visualising a pre-existing database schema? I'm using MySQL if it matters.
I'm currently using MySQL Workbench to process an SQL create script dump, but it's clunky, slow and a manual process to drag all the tables about (which would be okay if it wasn't so slow).
I use SQL::Translator with DBIx::Class
I have DBIx::Class in my toolchain anyway, and combining it with SQL::Translator allows me to convert the schema into lots of different formats. Mostly initialization SQL scripts for different database servers (making it easy to develop on SQLite and move to Postgresql for production) but it can output GraphViz data too, so diagrams are trivial to generate.